Nikon files patents for 10-30mm and 7-13mm lens for mirrorless cameras

Nikon filed a patent application 20110116172 (Japan, US versions) for a 10-30mm f/3.3-5.6 and 7-13mm f/3.5-5.6 lenses:

Nikon 10-30mm f/3.3-5.6

Nikon 10-30mm f/3.3-5.6

Nikon 7-13mm f/3.5-5.6

Are those two lenses for Nikon's mirrorless solution? Almost: the image height of both lenses is 7.96mm (sensor diagonal of 15.92mm) which suggests a crop factor of 2.8x. Previous patents and rumors indicated a crop factor of 2.5-2.6x based on a sensor with a diagonal of 17mm. Nikon is either obfuscating their patents or they have different mirrorless solutions in terms of sensor size (even though the difference is only about 1mm).

Patents details:

Nikon 10-30mm f/3.3-5.6

  • Focal length: 10.30 - 29.10mm
  • Aperture: 3.31 - 5.78
  • Angle of  view: 77.58 - 30.52 °
  • Image height: 7.962mm
  • Total lens length: 73.80 - 72.19mm
  • Back focus: 18.7255 - 39.4394mm
  • Zoom ratio: 2.825x
  • 3 aspherical elements

Nikon 7-13mm f/3.5-5.6

  • Focal length:6.90 - 12.61mm
  • Aperture: 3.62 - 5.77
  • Angle of view: 98.83 - 63.97 °
  • Image height: 7.962mm
  • Total lens length: 70.23 - 69.98mm
  • Back Focus: 14.6644 - 24.7483mm
  • Zoom ratio: 1.828x
  • 4 aspherical elements
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